This is probably a newbish question, but I've searched for the answer and found nothing.

I have my rampage water cooled (NB, SB, both mosfets, and the cpu all ek blocks), and temps are nice and solid 33-35C for all. There's 2x 120mm fans blowing on the mobo in general and 3 on the radiator.

BUT when I'm using that ASUS probe software there is a temp for MB (motherboard?) that climbs past 55C when I'm gaming (setting off some default alarm). Where is this temp sensor located, and am I going to hurt something running this at 55C +? It idles at ~42C. I wouldn't have worried if it didn't climb independent of the other temps.